WALTERS LILLY. (2000). SECRETS OF SUPERSTAR SPEAKERS: WISDOM FROM GREATEST MOTIVATORS OF OUR TIME AND WITH THOSE ? TATA MCGRAW-HILL.
Lua i Stíl Chicago (17ú heag.)WALTERS LILLY. SECRETS OF SUPERSTAR SPEAKERS: WISDOM FROM GREATEST MOTIVATORS OF OUR TIME AND WITH THOSE ? NEW DELHI: TATA MCGRAW-HILL, 2000.
Lua MLA (9ú heag.)WALTERS LILLY. SECRETS OF SUPERSTAR SPEAKERS: WISDOM FROM GREATEST MOTIVATORS OF OUR TIME AND WITH THOSE ? TATA MCGRAW-HILL, 2000.
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